<template>
  <div class="spec-preview">
    <img :src="skuInfo.skuDefaultImg" />
    <div class="event" @mousemove="masmove"></div>
    <div class="big">
      <img :src="skuInfo.skuDefaultImg" :style="{left:-2*left+'px',top:-2*top+'px'}"/>
    </div>
    <div class="mask" :style="{left:left+'px',top:top+'px'}"></div>
  </div>
</template>

<script>
  import { mapGetters } from "vuex"
  export default {
    name: "Zoom",

    data() {
      return {
        left: 0,
        top: 0,
      }
    },

    computed: {
      ...mapGetters('detail', ['skuInfo'])
    
    },
    methods: {
      masmove(e) {
        let x = e.offsetX -100
        if(x < 0)  x = 0
        if (x > 200) x = 200
        let y = e.offsetY - 100
        if(y < 0) y =0
        if (y > 200) y =200
        this.left = x
        this.top = y
      }
    },
    mounted() {
      this.$bus.$on('get-image', imgUrl => {
        this.skuInfo.skuDefaultImg = imgUrl
      })

    },
    beforeDetory() {
      this.$Bus.$off('get-image')
    }
    
  }
</script>

<style lang="less">
  .spec-preview {
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid #ccc;

    img {
      width: 100%;
      height: 100%;
    }

    .event {
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      z-index: 998;
    }

    .mask {
      width: 50%;
      height: 50%;
      background-color: rgba(0, 255, 0, 0.3);
      position: absolute;
      left: 0;
      top: 0;
      display: none;
    }

    .big {
      width: 100%;
      height: 100%;
      position: absolute;
      top: -1px;
      left: 100%;
      border: 1px solid #aaa;
      overflow: hidden;
      z-index: 998;
      display: none;
      background: white;

      img {
        width: 200%;
        max-width: 200%;
        height: 200%;
        position: absolute;
        left: 0;
        top: 0;
      }
    }

    .event:hover~.mask,
    .event:hover~.big {
      display: block;
    }
  }
</style>